One of the scariest effects of the game includes the Heartbeat. When you hear the heartbeat, you should know that something really bad is going to happen and that you're, to put delicately, completely screwed.

In GameEdit

You can hear your heartbeat in the game when the player notices a sudden change that shocks him. For example, when the Ghost of the deceased maid suddenly appears and leaves a note in The House 2
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The heart beat in The House 1-2